If you see an invasive plant in or around the Tahoe Basin, please report it. This information is used by local, state, and federal agencies as well as other organizations to help control and prevent these plants for expanding throughout the region. Reports should be made on Calflora.
https://www.calflora.org/add/pofaq.html
Calflora also has an application for Android and iOS devices for reporting plant occurrences.